About a year ago, I bought a couple of basil plants that come in small pots at the supermarket. They grew fine for a while but now a year later it has become quite stemmy and if I do anything with it, it threatens to die. I water it about once a week, and spray on some liquid fertiliser. It is kept indoors, temperature is about 20-22 degrees centigrade outdoors at the moment. I was watering it more frequently but I think it started to rot the root structure. It is planted in peaty soil. I really thought the warm weather would give it a boost but it is not doing much better than it was during the winter.
Any suggestions greatly appreciated